Anthrapyridones



United States Patent ANTHRAPYRDJONES Edward F. Elslager, Harper Woods, Mich., assignor to Parke, Davis & Company, Detroit, Mich, a corporation of Michigan No Drawing. Application December 2, 1953, Serial No. 395,833

11 Claims. (Cl. 260-278) This invention relates to a class of new isoquinoline compounds and to a process for producing the same. More particularly, the invention relates to isoquinoline compounds having the formula,

0 X N-CH: 11

5 NH-RN and acid addition salts thereof; where R is a divalent alkyl group containing from 2 to 5 carbon atoms, R1 is hydrogen or an alkyl or hydroxyalkyl radical containing not more than 2 carbon atoms and R2 is a hydroxyethyl or alkyl radical containing from 2 to 8 carbon atoms, or taken together with R1 and N represents a piperidino, morpholino or pyrrolidino group.

The compounds of the invention possess useful chemotherapeutic properties, especially as amebacidal agents being particularly efiective in combatting E. histolytica.

The new compounds may be employed in the form of the free base having the above formula or the addition salt of an oganic or inorganic acid. One of the preferred isoquinoline compounds of the invention is 6-( -diethy1- aminopropylamino) 3 methyl-7H-dibenz[f,i jlisoquinoline 2,7(3H)-dione or the acid addition salt thereof. In general, acid addition salts of any relatively nontoxic organic or inorganic acid are suitable. Some typical examples of these salts are the hydrochloride, hydrobromide, sulfate, phosphate, oxalate, suliamate, sulfonate, acetate, lactate, tartrate, gluconate, citrate, salicylate (especially 5,5-methylene disalicylate), benzoate, pamoate, cresotinate (especially methylene-di-o-cresotinate) naphthoate (especially 3-hydroxy-2-naphthoate), and the like. One of the preferred sulfonic acid salts is the salt of 8-hydroxy-7-iodo-5-quinoline sulfonic acid. This salt has the advantage in that the acid moiety itself possesses amebacidal properties.

Other preferred salts of the isoquinoline compounds are the penicillinates (especially the benzyl penicillinates); these penicillinate salts are advantageous in that they possess both amebacidal and antibacterial properties.

In accordance with the invention the above isoquinoline compounds are produced by condensing a 6-halo-3- 2,756,234 Patented July 24, 1956 methyl 7H dibenz[f,i jlisoquin'oline 2,7(3H) dione having the formula,

where X is a halogen atom such as a bromine or chlorine atom and R, R1 and R2 have the aforementioned significance.

In carrying out the condensation it will usually be satisfactory to employ substantially equivalent quantities of the reactants in conjunction with an organic solvent such as pyridine, benzene, toluene, xylene, dioxane, petroleum ether and the like. If desired an excess of either of the reactants may be employed, but it is preferable to employ the amine in excess since it serves in most cases as a particularly useful solvent. The temperature of the reaction can be varied considerably and is not particularly critical. In general, the reaction is favored by temperatures in excess of C. Preferably the reaction is carried out in the range from about C. to the reflux temperature of the particular amine employed. If desired, the reaction may be carried out in the presence of a condensation catalyst such as the copper salts, copper dust and the like. chloride can be advantageously employed as a catalyst.

The invention is illustrated by the following examples.

Example 1 A mixture of 20 g. of 6-bromo-3-methyl-7H-dibenz- [f, i j]isoquinoline-2,7(3H)-dione, 25 g. of fi-diethyl aminoethylamine, and a trace of cuprous chloride as catalyst is heated at C. for six hours. Upon cooling, the mixture is poured into a 3-1. three-neck flask together with 100 cc. of 2 N sodium hydroxide and steam distilled for two hours. The mixture is cooled, the alkaline solution is decanted, and the dark red gum which remains is extracted with 10% acetic acid by warming on the steam bath. The red acid extract is heated with decolorizing charcoal, filtered, and the filtrate made strongly alkaline with 20% sodium hydroxide solution. The dark red gum Which separates is crystallized from benzene. The red crystalline product, 6-(fi-diethylaminoethylamino) 3 methyl 7H dibenzEf, i j]isoquinoline- 2,7(3H)-dione has a melting point of 194-196 C. The formula of the product is,

A mixture of 100 g. of 6-bromo-3-methyl-7H-dibenz- [f,i jlisoquinoline -.2,7(3H) dione, 200 g. of -diethyb For example, cuprous 7 mino m m nd a r c q pr s h o as catalyst is stirred and refluxed for fifteen hours. Upon cooling, the dark red mixture is poured into a 5 1. threeeqk fl k g h -WiIh6DQ c of N: o ium-hy roxid solution, and the mixture is steam-distilled;fiqritwohours,

Example 3 A mixture of 34.,g.,of 6-bromo-3-methyl-7H-dibenz- [Lij]isoquinoline-2,7(3H)-dione, 34 g. of e-(l-pipezidino) amylamine, and 60 g. of dry pyridine is refluxed for eighteen hours. The mixture is cooled, the residue is poured into a -1. three-neck flask, 200 cc. of-2 Nsodium hydroxide is added, and the mixture is steam distilled GET-OH:

CHz-C 2 V Example 4 A mixture of 50 g. of 6-bromo-3-methyl-7-dibenz[f,ij]- isoquinoline-2,7-(3I-l)-dione, 100 g. of -isopropylaminopropylamine, and a trace of cuprous chloride as catalyst is stirred and heated at 115l20 C. for sixteen hours.

'The mixture is cooled and poured into a 5-1. three-neck flask together with 300 cc. of 2 N sodium hydroxide. The mixture is steam-distilled for four hours, the residue is cooled, and the alkaline solution decanted from the gummy red solid. The gum is extracted with warm acetic acid, the extract is treated with decolorizing charcoal, filtered, and the red filtrate 'is made strongly alkaline with sodium hydroxide solution. A dark red gum is} obtained, which upon recrystallization from benzene gives the desired 6'-(-y-isopropylaminopropylamino) 3 4* methyl 7H dibenzlfiij] -is oquinoline-2,7(3H) -dione, of formula,

1 IH(oH );NH-oH oH3)i This product exists .as orange-red crystals which soften at 153 C., and melt at l57'l58 C. The dihydrochloride salt is obtained by. dissolving the product in benzene and treating with an excess of dry hydrogen chloride.

E a p e 5 v A mixture of 50 g. of 6 -bromo-3-methyle7-dibenz[f,ij]-

isoquinoline-2,7(3H) -dione, 100 g. of 'y.-(4,-morpholino)- propylamine, and a trace of cuprous chloride as catalyst is heated and stirred at 105"-l10' C; for sixteen hours. Upon cooling, the mixture is poured into, a 5-1. three-neck flask together with 300 cc. of 2 N sodium hydroxide and steam distilled for four hours. The mixture is cooled, the alkaline solution is decanted,,and the residual dark red gum is extracted with warm 10% acetic acid. The warm acidextract is treated with decolorizing charcoal, filtered, and the filtrate made strongly alkaline with 20% sodium hydroxide solution. The dark red gum which separates is Washed with water andrecrystallized from benzene in the form of glistening orange-red crystals, M. P. 203.5-

' 204.5 C. This product, 3-methyl-6-[v-(4-morpholino)- propylamino]-7H-dibenz[f,ijl isoquinoline 2,7 (3H)-dione, has the formula, H

. I V CHPCHQ 0 NET-(CHAN. I o

'CHfi-CHB Example 6 A mixture of 20 g. of 6-bromo-3-methyl-7H-dibenz- [f,ij]isoquinoline-2;7(3H)-dione, 20 g. of -bisfle-hydroxyethyl)aminopropylamine, and a trace of cuprous chloride as catalystis'stirredand'heated at 180 C. for:

six hours. The'reaction mixture is-cooled to C.',

200 cc. of'water-is'added, and'the oilyresidue ispoured into 200 cc. of 2 N sodiumshydroxide solution. The alka} line solution is decanted, the darkured gum. is washed with.

desired 6- [v-bis (5 hydroxyethyl) aminopropylam'inol-3 methyl-7H-dib enz [f,ij] is oquinoline-ZJ (3H) -dione, offormula, I i

A T (C 2)sN(QH2QH1QH)3 is precipitated as the phosphoric'acid salt by the additio of phosphoric acid. 7

iiij]isoquinoline-2,7(3H)-dione, 23 g. rolidino)-ethylamine, and 60 g. of dry pyridine is re- Example 7 A mixture of 20 g. of 6-bromo-3-methyl-7H-dibenz- [f,ijlisoquinoline-2,7(3H)-dione, 13 g. of fl-(fi-hydroxyethylamino)ethylamine, and a trace of cuprous chloride as catalyst is stirred and heated at 150 C. for twelve hours. Upon cooling, the dark red mixture is poured into a three-neck flask together with 200 cc. of 2 N sodium hydroxide solution, and the mixture is steam distilled for three hours. The mixture is cooled, the alkaline solution is decanted, and the dark red gum is extracted with warm 10% acetic acid. The red acid extract is heated with decolorizing charcoal, filtered, and the red filtrate made strongly alkaline with 20% sodium hydroxide solution. The dark red hydroscopic gum which separates is dissolved in ethanol, and the desired 6-[fi-(B-hydroxyethyl-' amino)ethylamino] 3 methyl7H-dibenz[f,ij]isoquinoline-2,7 (3H) -dione, of formula,

I N-CH:

| g NH-(CHzhNH-CHzCHzOH is precipitated as the phosphoric acid salt by the addition of phosphoric acid.

Example 8 A mixture of 20 g. of 6-chloro-3-methyl-7H-dibenz [f,ijlisoquinoline-2,7(3H)-dione, 25 g. of e-(ethyl-B- hydroxyethylamino)amylamine, and a trace of cuprous chloride is stirred and heated at 150 C. for twelve hours. Upon cooling, the dark red mixture is poured into a three-neck flask together with 200 cc. of 2 N sodium hydroxide solution, and the mixture is steam distilled for three hours. The mixture is cooled, the alkaline solution is decanted, and the dark red gum is extracted with warm 10% acetic acid. The red acid extract is heated with decolorizing charcoal, filtered, and the red filtrate made strongly alkaline with 20% sodium hydroxide solution. The dark red hygroscopic gum which separates is dissolved in ethanol, and the desired S-[E-(ethyI-B- hydroxyethylamino)amylaminol 3 methyl 7H dibenz-[f,ij]isoquinoline-2,7(3H) -dione of formula,

i N-CH:

is precipitated as the phosphoric acid salt by the addition of phosphoric acid.

Example 9 A mixture of 34 g. of 6-bromo-3-methyl-7H-dibenz of fi-( -py fluxed for eighteen hours. The mixture is cooled, the residue is poured into a l. three-neck flask, 200 cc. of 2 N sodium hydroxide is added, and the mixture is steam distilled for three hours. The residue is cooled, the alkaline solution is decanted, and the dark red residue is extracted with 10% acetic acid. The acid extract is treated with decolorizing charcoal, filtered, and is made strongly alkaline with 20% sodium hydroxide solution. A red gum separates and is isolatedand allowed to solidify. The product is obtained in pure form by recrystallizing this solid residue from acetone. The product, 3-methyl-6- [,6- l-pyrrolidino) ethylamino] 7H-dibenz[f,ij]-isoquinoline-2,7(3H)-dione, has the formula,

N-GHa OH H] Example 10 A mixture of 50 g. of 6-bromo-3-methyl-7-dibenz [f,ijlisoquinoline-2,7(3H)-dione, 56 g. of -octylaminopropylamine, and a trace of cuprous chloride is stirred and heated at 120 C. for sixteen hours. The mixture is cooled and poured into a three-neck flask together with 300 cc. of 2 N sodium hydroxide. The mixture is steam-distilled for four hours, the residue is cooled and the alkaline solution decanted from the residual solid. The residue is extracted with warn 10% acetic acid and the extract is treated with decolorizing charcoal and filtered. The filtrate is made strongly alkaline with 20% sodium hydroxide solution and allowed to stand for the separation of the desired product, 6 ('y octylaminopropylamino) 3 methyl 7H dibenz[f,ij]-isoquinoline-2,7(3H)-dione, of formula,

The product can be purified if desired by recrystallization from benzene.

Example 11 A mixture of 20 g. of 6-bromo-3-methyl-7H-dibenz- [f,ijlisoquinoline-2,7(3H)-dione, 20 g. of E-diethylamino-a-methylbutylamine and a trace of cuprous chloride as catalyst is stirred and heated at C. for twelve hours. Upon cooling, 200 cc. of 2 N sodium hydroxide are added to the reaction mixture, and the mixture is steam distilled for three hours. The mixture is cooled, the alkaline solution is decanted, and the dark red gum is extracted with warm 10% acetic acid. The red acid extract is heated with decolorizing charcoal, filtered, and the red filtrate made strongly alkaline with 20% sodium hydroxide solution. The product which separates is washed with water and recrystallized from benzene. The product, 3-methyl-6-[6-diethylamino-amethylbutylamino] 7H dibenz [f,ijlisoquinoline 2,7 (3H)-dione, has the formula,

0 H (\T-CH:

CH3 CHICKS IL NH-J) H-(CHz) 3N CHzCH:

7 The product is obtained as the dihydrocbloride salt by treating an ethanolic solution of .the product with an excess of dry hydrogen. chloride.

Example 12 dibenz[f,ijlisoqui'noline 2,7(3H) dione, 7 iodo 8-hydroxyquinoline-5-sulfonate, has the formula,

Example13 A mixture of 50 g. of 6-bromo-3-rnethyl-7H-dibenzf,ij]isoquinoline-2,7(3H)-dione, 56 g. of y-(a-methylheptylamino)propylamine and a trace of cuprous chloride is stirred and heated at 115-120" C. for sixteen hours. The mixture is cooled and poured into athree-neck flask together with 300 cc. of 2 N sodium hydroxide. The mixture is steam-distilled for four hours, the residue is cooled and the alkaline solution decanted from the residual solid. The residue is extracted with Warm acetic acid and the extract is treated with decolorizing charcoal and filtered. The filtrate is made strongly alkaline with 20% sodium hydroxide solution and allowed to stand for the separation of the desired product, 6-[- -(u-methyl heptylamino)propylamino]3 methyl 7H dibenz- [f,ij]isoquinoline-2,7(3H)-dione, of formula,

The dihydrochloride salt is obtained by dissolving the product in benzene and treating with an excess of dry hydrogen chloride.

y-(a-Methylheptylamino)propylamine, used in the preparation of the above isoquinoline compound, can be prepared in the following manner: trimethylene diamine (59.2 grams) is stirred and heated to C. Heating is then stopped and 38.6 g. of B-bromooctane is added slowlyover a period of about 20 minutes during which the temperature rises to about 100 C. Heating is then continued at 100-145 C. for one and one-half hours. The cooled mixture is transferred to a separatory funnel, the upper layer is treated with 250 ml. of water, the mixture is extracted with ether, and the ether extract is washed thoroughly with water and dried over anhydrous sodium sulfate. Removal of the solvent from the dried ether solution yields the desired 'y-(a-methylheptylamino)propylamine as a low melting, white, waxy solid.

Example 14 A filtered solution of 3.72 g. of potassium benzyl penicillin in 10 cc..of water is slowly added to a solution of 4.12 g. of 6-(y-isopropylaminopropylamino)-3-methylpractice of the invention are known compounds.

7H-dibenz [f,ij isoquinoline-2,7 3H) -dione hydrochloride in 5 cc. of water at room temperature with stirring. The red oil which separates is-triturated with several portions of ether, and by vigorous scratching, the product solidifies. The product, 6-(y-isopropylaminopropylamino) -3-methyl- 7 H-dibenz [f,ij isoquinoline-2,7 (3H) -dione, benzyl penicillinate is purified by recrystallizingfrom an ethanol-ether mixture. The product has the formula,

The 6-halo-3-methy1-7H-dibenz[f,ij]isoquinoline-2,7- V

(3H)-dione compounds used as starting materials in the The hydroxyalkylaminoalkylamines can be prepared by reacting an N-(bromooalkyl) phthalimide with a hydroxyalkylamine and subjecting the resulting product to acid hydrolysis. V

The preparation of the hydroxyalkylaminoalkylamine compounds is illustrated by'the following specific example.

e-(Ethyl-fi-Izydroxyethylamino) Zzmylamz'na-A mixture of 480 g. of monoethylethanolamine, 220 g. of N-(ebromoamyl) phthalimide and 2 l. of xylene is refluxed for 18 hours. Upon cooling, one mole of potassium carbonate is added with stirring and the xylene and excess amine are removed in vacuo. The residue is extracted with methylene chloride, and the methylene chloride. is removed in vacuo from the extract leavingN-[e-(ethyl-fihydroxyethylamino)amylJphthalimide as a viscous oil. The oil is hydrolyzed by refluxing with 400 cc. of 20% and is repeatedly dried over solid potassium hydroxide.

Distillation of the oil in vacuo gives e-(ethyl-B-hydroxyethylamino) amylamine; B. P. 103-105 C. at 1.5 mm., N 1.4870.

In accordance with the invention, the new 6-an1ino-.

alkylamino 3 methyl 7H dibenz[f,ij]isoquinoline 2,7( 3H) -dione compounds can be converted from the acid addition salt form to the free base form by dissolving the compounds in a suitable solvent such as water and neutralizing the solution with an organic or inorganic base such as sodium hydroxide, ammonium hydroxide, sodium carbonate, potassium carbonate, tertiary organic amines and the like. In some instances it will be desirable to obtain the acid addition salt from the free base. The salt can be prepared byreaction of the free base with the corresponding organic or inorganic acid in a suitable solvent. The following specific example serves as an illustration of the method of converting the addition salt of hydrochloric acid to the free base and then converting the fre base to the addition salt of a different acid. 1 0.5 g. of 6-(' -cliethylaminopropylamino)-3-methyl-7H- dibenz[f,ij]isoquinoline-2,7(3H) -dione, dihydrochloride,

is shaken with 1 ml. of concentrated ammonium hydroxide in 9 ml. of water. The free base,6-(y-diethylaminopropylamino) 3 methyl 7H dibenz[f,ijlisoquinoline 2,7(3H)-dione,separates out and is isolated and extracted with ether. The ether extract is washed with water and dried over anhydrous potassium carbonate.

If desired, the free base can be isolated in pure form by I filtering off the potassium carbonate and removing the ether in vacuo. Upon addition of an alcoholic solution of citric acidto the ether' solution of the .free base'the red citric acid salt of 6-(y-diethylaminopropylamino) -3- methy1-7H-dibenz[f,ij]isoquinoline2,7-(3H)-dione precipitates out. This compound is recovered in pure'form by filtering and recrystallizing the precipitate from alcohol.

What I claim is:

l. A compound of the class consisting of a free base and its acid addition salts, said free base having the formula,

l N-C H:

where R is a divalent alkyl group containing from 2 to 5 carbon atoms, R1 is a member of the group consisting of hydrogen and alkyl and hydroxyalkyl radicals containing not more than two carbon atoms and R2 is a member of the group consisting of alkyl and hydroxyalkyl radicals containing from two to eight carbon atoms and further members wherein R1 and R2 taken together with -N represent a radical of the class consisting of piperidino, morpholino and pyrrolidino radicals.

2. A compound having the formula,

l N-CH:

R: b lean-M 3. An acid addition salt of a compound having the formula,

N-CH:

where R, R1 and R2 are lower alkyl.

4. An acid addition salt of a compound having the formula,

I N-CH:

where R is alkyl and R1 and R2 taken together with -N represent a piperidino radical.

5. An acid additionsalt of a compound having the formula,

N-OH:

dIH-R-NH-alkyl where R is a divalent alkyl group containing from 2 to 5 carbon atoms and said alkyl is an alkyl radical containing from two to eight carbon atoms.

6. An acid addition salt of a compound having the formula,

where R is a divalent alkyl group containing from 2 to 5 carbon atoms and said hydroxyalkyl is a hydroxyalkyl radical containing from two to eight carbon atoms.

7. A hydrochloric acid salt of a compound having the formula,

I N-CH:

1 1 with analk laminealyk l'aminehaving the formula,{

NH:-RN

R: where X is a halogen atom; Ris a divalent alkyl group containing from 2 to 5 carbon atoms, R1 is a member of the group consisting of hydrogen'and alkyl and hydroxyalkyl radicals containing not more than two carbon atoms and R2 is a member of the group consisting of alkyl and hydroxyalkyl radicals containing from two to eight carbon atoms and further members wherein R1 and g 12 R2 taken together with -N represent a radical of the class consisting of piperidino, morpholino and pyrrolidino' radicals. V

5 References Cited in the file of this patent UNITED STATES PATENTS" 2,5791'85' Granatek Dec. 18,- 1951 FOREIGN PATENTS 10 486 Great Britain Nov. 12, 1908 

1. A COMPOUND OF THE CLASS CONSISTING OF A FREE BASE AND ITS ACID ADDITION SALTS, SAID FREE BASE HAVING THE FORMULA, 